On Dec. 7, Republican Presidential candidate Donald Trump called for a halt to all Muslim immigration to the United States. Professor Kagan warned, "What Trump is proposing may already be authorized by statute, so that a newly inaugurated President could implement this proposal without new authorization from Congress. Even worse, it would not clearly be unconstitutional under existing case law."

Professor Kagan spent a decade developing legal aid programs for
refugees in the Middle East, and has written several of the most widely
cited articles in the fields of refugee and asylum law.